Remove unused indexes (#1520)

Based on analysis from planet builds for this layer as well as running updates via the integrity script as discussed in #1516, these three indexes are not used and can be removed.

layers/place/update_city_point.sql

@@ -49,8 +49,6 @@ $$ LANGUAGE SQL;
 
 SELECT update_osm_city_point(true);
 
-CREATE INDEX IF NOT EXISTS osm_city_point_rank_idx ON osm_city_point ("rank");
-
 -- Handle updates
 
 CREATE OR REPLACE FUNCTION place_city.store() RETURNS trigger AS

layers/place/update_country_point.sql

@@ -98,8 +98,6 @@ $$ LANGUAGE SQL;
 
 SELECT update_osm_country_point(true);
 
-CREATE INDEX IF NOT EXISTS osm_country_point_rank_idx ON osm_country_point ("rank");
-
 -- Handle updates
 
 CREATE OR REPLACE FUNCTION place_country.store() RETURNS trigger AS

layers/place/update_state_point.sql

@@ -60,8 +60,6 @@ $$ LANGUAGE SQL;
 
 SELECT update_osm_state_point(true);
 
-CREATE INDEX IF NOT EXISTS osm_state_point_rank_idx ON osm_state_point ("rank");
-
 -- Handle updates
 
 CREATE OR REPLACE FUNCTION place_state.store() RETURNS trigger AS